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k in (-oo:+oo)
5*k-(9/5) = 3 // - 3
5*k-(9/5)-3 = 0
5*k-9/5-3 = 0
5*k-24/5 = 0 // + 24/5
5*k = 24/5 // : 5
k = 24/5/5
k = 24/25
k = 24/25
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